I was under the understanding that there will always be some of that.
I have some daily that I remove.
My PO4 is at 0.04 and no NO3
I do have micro algae in a refugium though. I only get the film on the glass not on my rocks. I find that strange as my rocks have been cooked and are more or less white.
Do you feed Phyto I find that when I feed that I get more of a film than when I feed something else. One other thing I only get a film on my main tank. My refugium never has any and I have M/H running on both tanks.
Picture to show how white my rocks are still waiting for the coraline to start taking over.
I don't run additives only amino acids though so can't comment on that part.
